net/samba420: Unbreak samba 4.20

This fix the 0100 patch to make file creation working. The
patch has been updated to not alter too much the patch, to
make it working.

This make now samba 4.20 working even if it has only be tested
on Windows and MacOS with basic functionality.

PR: 284623
Approved by: 0mp (mentor)
Approved by: samba (kiwi)
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D50778